Form for windings and the like



March 18, 1952 w, s-

FORM FOR WINDINGS AND THE LIKE Filed May 29, 1947 Patented Mar. 18, 1952UNITED STATES BENT OFFICE 2,589,649 O M EQR.WIN I TD LIKE. :WilliamF;Stahl, Kenilworth, In. Apirlicationlt/Iayfifl, 1947, Serial No. 751,340

- 1- T isinvention relates t formiqr w ndin s. an w t e-method cf. cr arnsthesame. ,Itiiis, particularly useful as a bobbin or spool1 tpr coilwin ingsal hou h. tO V u1y wi l b anpl ab somewhat unsatisfactory forcertain windings'because of the tendency of leakageof current about theends. of t e ubu ar insert ur emrresularities or warping of the endflanges hay/eresulted in increasing the crevices through which a shortmay occur.

An. Qbject of the present invention isto pr vide structure whichovercomes the abqve gi sadvantage and provides an unu y c means,for-sealing the windings against, forming a short in the circuit, Yetanother object is to provide a, structure in which a tubular insert isemployed having resil-ier t end portions which c nm'rmto an irre ularitis. iut ccntcu of the flanges and thus form a tight seal against thepassage of current. A still further object is to provide a tubularinsert structure for bobbins which maintains the coils at such adistancefrom the core and flange joints as to prevent any loss ofcurrent. Still another object is to provide a bobbin of novelconstruction which is unusually effective as a form for electricalwindings and the like.- Other specific objects and advantages willappear as the specification proceeds'f The invention is illustrated, ina preferred embodiment, by the accompanying drawing;'in which- Figure 1is a perspective view of a form embodying my invention; Fig. 2, anenlarged-ye ical sectional view; and Fig. 3, a sectional de a1 view ofthe tubular insert or enclosure for'the bobbin core.

In the illustration given, It! designates a core which may be formed oflaminated paper strips or of any other suitable material. Itv may beformed of paper impregnated with resinous or other material, or itmay bea molded body formed of plastic, etc. Over the core I0 is placed thesheath or spacing member ll, which may be formed of cellulose acetate orany suitable insulating plastic material, paper, etc. If desired, aninner apertured disk l2 may be provided at lit each end of the core.

and providedwith a substantially straight inner ring-fit. The disks 12have their inner end poi? a iens-bearing against the inner side oftherin portions l 6 and their inner edges-squarely engaging the corel-ll. Sucha positioning of the-disks I2 under the pressure of the springflanges l5 lock-the flanges I3 against inward movement on core I.

If the end flanges ordisks l2 are not employed, the resilient ends l5 ofthe-spacer member H still serve efiectively as a sealing means byengaging m finiiflanges l2 and the resilient character of theflanges 15cause them to follow-the contour of the flanges -l2- ir1especti-ve ofirregularities ther in.-

inthemethod of'assembly and of use, it prefer o u e the. f lowing tep Te core I0 slp lvided first with the spacer member l l as sh in Fig. 2,and the disks 12 are placed against the bell-shaped ends IS. The flangesl3 are next placed in position against the disks l'2, andthe ends of thecore which project beyond the ring portions [6 of flanges 13 are swagedoutwardly to produce the locking shoulders I l. A suitable spinningmethod is described in my Patent No. 2,343,389 which issued March 7,1944. At the time of the spinning or swaging of the ends of the core,the flanges I3 are preferably pressed inwardly so as to flex the springflanges l5, oi the spacermember I I, or, alternatively, the spinning orswaging operation may be controlled so as to force the flanges l3inwardly during the actual forming of the shoulders 14 and thus to bringabout a tight locking of the flanges [3 in the position illustrated inFig. 2.

The tubular core member I0 may. be of any desired shape, such as, forexample, circular, rectangular, etc., and the flanges l3 and othermembers may similarly be of any desired shape.

The plastic material, such as cellulose acetate, etc., suggested for thespacer member II and the end disks I2 is found to be particularly usefulin that such material, while being very thin, is

nevertheless sturdy and provides the rigid lock page of the flanges [3.The flared ends l of the I spacer member provide a substantial air gapbetween it and the joints at the ends of the core.

member while at the same time forming a tight seal with the end flangeswhich it engages.

While in the foregoing specification, I have set forth a singlestructure in substantial detail for" the purpose of illustrating oneembodiment of the invention, it will be understood that the details ofsuch structure may be modified widely by those skilled in the artwithout departing from videlockingshoulders maintaining said flanges onsaid core, and a tubular member extending about said core between saidflanges and having flared -end portions engaging said flanges and urgingthem toward said shoulders.

.2. .A form for windings and the like, comprising a tubular core member,apertured flanges received uponsaid core at the ends thereof, said corehaving its end portions turned outwardly 'tojprovide locking shouldersmaintaining said flanges on said core, apertured end disks lying,against the inner sides of said flanges and having -edges engaging saidcore member, and a tubular member extending about said core and havingflared end portions engaging said disks and urging them toward saidflanges. v

3. A form for windings and the like, compris- 4. In a form for windingsof the character set forth in which a hollow core member is providedwith locking shoulders at its ends, apertured flanges received upon theends of said core and being maintained thereon by said lockingshoulders, a spacer member between said apertured flanges and havingresilient, flared end portions abutting said apertured flanges on thecore and urging said apertured flanges toward said shoulders.

5. A form for windings and the like, compris- 'ing a tubular core memberof substantially unihaving its end portions turned outwardly to proing atubular core member, apertured flanges received upon said core at theends thereof, said core having itsend portions turned outwardly -toprovide locking shoulders maintaining -said flanges on said core,apertured end disks lying against the inner sides of said flanges andhaving edges engaging said core member, and a tubular member extendingabout said core and having flared end portions engaging said disks andurging them toward said flanges, said tubular member anddisksbeingformed of resilient plastic material. i

form cross section, apertured flanges having a central portion ofisetinwardly, the ends of said 1 core being turned outwardly to providelocking shoulders engaging said offset portion, end disks having innerend portions engaging the core and abutting-said offset flange portions,and a tubular spacer member snugly engaging said core member and havingits ends flared to provide bell-shaped terminals engaging said disks andurging them against the ofiset portion of said end flanges.

6. A method of making forms for windings and the like, comprisingplacing a tubular spacing member having flared resilient ends upon a'tubular core, inserting apertured flanges over each end of the core,pressing the flanges against the resilient ends of said core, andturning the ends of the core outwardly against the flanges to lock themagainst said compressed flared ends of the spacing member. I WILLIAM F.STAHL; I

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

